package misc;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Sha1 {
	
	/**
	 * Convert to Hex
	 * 
	 * @param data
	 * @return
	 */
	private static String convertToHex(byte[] data) { 
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < data.length; i++) { 
            int halfbyte = (data[i] >>> 4) & 0x0F;
            int two_halfs = 0;
            do { 
                if ((0 <= halfbyte) && (halfbyte <= 9)) 
                    buf.append((char) ('0' + halfbyte));
                else 
                    buf.append((char) ('a' + (halfbyte - 10)));
                halfbyte = data[i] & 0x0F;
            } while(two_halfs++ < 1);
        } 
        return buf.toString();
    } 

	/**
	 * String to sha1
	 * 
	 * @param text
	 * @return
	 */
    public static String StringToSha1String(String text) 
    { 
	    try {
			MessageDigest md;
			md = MessageDigest.getInstance("SHA-1");
			byte[] sha1hash = new byte[40];
			md.update(text.getBytes("iso-8859-1"), 0, text.length());
			sha1hash = md.digest();
			return convertToHex(sha1hash);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
			return "";
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
			return "";
		}
    }
}